// Copyright (c) 2004 Brian Wellington (bwelling@xbill.org)

package org.xbill.DNS;

import java.io.IOException;

/**
 * ISDN - identifies the ISDN number and subaddress associated with a name.
 *
 * @author Brian Wellington
 * @see <a href="https://tools.ietf.org/html/rfc1183">RFC 1183: New DNS RR Definitions</a>
 */
public class ISDNRecord extends Record {
  private byte[] address;
  private byte[] subAddress;

  ISDNRecord() {}

  /**
   * Creates an ISDN Record from the given data
   *
   * @param address The ISDN number associated with the domain.
   * @param subAddress The subaddress, if any.
   * @throws IllegalArgumentException One of the strings is invalid.
   */
  public ISDNRecord(Name name, int dclass, long ttl, String address, String subAddress) {
    super(name, Type.ISDN, dclass, ttl);
    try {
      this.address = byteArrayFromString(address);
      if (subAddress != null) {
        this.subAddress = byteArrayFromString(subAddress);
      }
    } catch (TextParseException e) {
      throw new IllegalArgumentException(e.getMessage());
    }
  }

  @Override
  protected void rrFromWire(DNSInput in) throws IOException {
    address = in.readCountedString();
    if (in.remaining() > 0) {
      subAddress = in.readCountedString();
    }
  }

  @Override
  protected void rdataFromString(Tokenizer st, Name origin) throws IOException {
    try {
      address = byteArrayFromString(st.getString());
      Tokenizer.Token t = st.get();
      if (t.isString()) {
        subAddress = byteArrayFromString(t.value);
      } else {
        st.unget();
      }
    } catch (TextParseException e) {
      throw st.exception(e.getMessage());
    }
  }

  /** Returns the ISDN number associated with the domain. */
  public String getAddress() {
    return byteArrayToString(address, false);
  }

  /** Returns the ISDN subaddress, or null if there is none. */
  public String getSubAddress() {
    if (subAddress == null) {
      return null;
    }
    return byteArrayToString(subAddress, false);
  }

  @Override
  protected void rrToWire(DNSOutput out, Compression c, boolean canonical) {
    out.writeCountedString(address);
    if (subAddress != null) {
      out.writeCountedString(subAddress);
    }
  }

  @Override
  protected String rrToString() {
    StringBuilder sb = new StringBuilder();
    sb.append(byteArrayToString(address, true));
    if (subAddress != null) {
      sb.append(" ");
      sb.append(byteArrayToString(subAddress, true));
    }
    return sb.toString();
  }
}
